The @openwebdocs BCD collector project v10.12.1 found new features shipping in Firefox 129 beta which was released yesterday. Currently, the collector covers about 90% of BCD, so the following list might not be exhaustive. Also, if a feature is in Firefox Nightly only, it is not considered here.

With this PR, BCD considers the following 29 features as shipping in Firefox 129:

• api.CSSPageDescriptors (https://bugzil.la/1890842)
• api.CSSPageDescriptors.margin (https://bugzil.la/1890842)
• api.CSSPageDescriptors.margin-bottom (https://bugzil.la/1890842)
• api.CSSPageDescriptors.margin-left (https://bugzil.la/1890842)
• api.CSSPageDescriptors.margin-right (https://bugzil.la/1890842)
• api.CSSPageDescriptors.margin-top (https://bugzil.la/1890842)
• api.CSSPageDescriptors.marginBottom (https://bugzil.la/1890842)
• api.CSSPageDescriptors.marginLeft (https://bugzil.la/1890842)
• api.CSSPageDescriptors.marginRight (https://bugzil.la/1890842)
• api.CSSPageDescriptors.marginTop (https://bugzil.la/1890842)
• api.CSSPageDescriptors.size (https://bugzil.la/1890842)
• api.CSSStartingStyleRule (https://bugzil.la/1900458)
• api.GeolocationCoordinates.toJSON (https://bugzil.la/1890706)
• api.GeolocationPosition.toJSON (https://bugzil.la/1890706)
• api.Navigator.vibrate (removal) (https://bugzil.la/1950037)
• api.PerformanceResourceTiming.contentType (https://bugzil.la/1800443)
• api.PerformanceResourceTiming.responseStatus (https://bugzil.la/1796785)
• api.RTCDTMFSender.canInsertDTMF (https://bugzil.la/1623193)
• api.TextEvent (https://bugzil.la/1901923)
• api.TextEvent.data (https://bugzil.la/1901923)
• api.TextEvent.initTextEvent (https://bugzil.la/1901923)
• css.at-rules.starting-style (https://bugzil.la/1900458)
• css.properties.transition-behavior (https://bugzil.la/1901645)
• javascript.builtins.DataView.getFloat16 (https://bugzil.la/1903329)
• javascript.builtins.DataView.setFloat16 (https://bugzil.la/1903329)
• javascript.builtins.Float16Array (https://bugzil.la/1903329)
• javascript.builtins.Float16Array.Float16Array (https://bugzil.la/1903329)
• javascript.builtins.Math.f16round (https://bugzil.la/1903329)
• javascript.regular_expressions.named_capturing_group.duplicate_named_capturing_groups (https://bugzil.la/1903288)

Again, I hope this PR is useful to provide updates to BCD in an easy, fast and accurate way. If you have feedback, let me know!

See also mdn/mdn#565 and https://www.mozilla.org/en-US/firefox/129.0beta/releasenotes/